Absolutely amazing sheath. Easily the best I have ever used.
The whole thing is quite modular. You can remove the plastic insert, heat it, and form it to the shape of your knife to enhance retention. The handle retention strap can also be adjusted to fit a variety of handle shapes,
The only drawback that I can think of is that the secure points on the backside are a bit small for some leg straps; if you want to add one, you'll either need to be able to remove and reattach the clasps on your strap, or you'll need a strap with a clasp that can squeeze through a 1.5" gap. Not much of a drawback, really.
Anyway, I highly recommend the combat master sheath.
Best,
- Mike